@media (max-width: 1100px) {
  .gnb {
    display: none;
  }
  .menu-toggle {
    display: block;
  }
  .brand {
    width: 230px;
  }
  .mobile-menu.is-open {
    display: grid;
    grid-template-columns: repeat(3, 1fr);
    position: absolute;
    top: 86px;
    left: 0;
    right: 0;
    background: #fff;
    padding: 28px;
    border-bottom: 1px solid var(--line);
    box-shadow: var(--shadow);
  }
  .mobile-menu section {
    display: grid;
    align-content: start;
    gap: 7px;
  }
  .mobile-menu strong {
    color: var(--teal);
    margin-bottom: 4px;
  }
  .mobile-menu a {
    font-size: 13px;
    color: var(--body);
  }
  .admin-stats {
    grid-template-columns: repeat(3, 1fr);
  }
  .media-manager-grid {
    grid-template-columns: repeat(2, minmax(0, 1fr));
  }
  .book-grid {
    grid-template-columns: repeat(3, 1fr);
  }
  .auth-shell.is-signup {
    grid-template-columns: minmax(300px, 0.6fr) minmax(0, 1.4fr);
  }
  .auth-shell.is-signup .auth-panel {
    padding-inline: 40px;
  }
}
@media (max-width: 768px) {
  .media-manager-grid {
    grid-template-columns: 1fr;
  }
  .container {
    width: min(100% - 32px, var(--container));
  }
  .site-header {
    height: 72px;
  }
  .header-inner {
    padding: 0 16px;
  }
  .brand {
    width: 190px;
  }
  .header-link {
    display: none;
  }
  .search-panel.is-open {
    inset: 72px 0 auto;
    padding: 18px 16px;
    gap: 10px;
    flex-wrap: wrap;
  }
  .search-panel label {
    flex: 0 0 100%;
    font-weight: 700;
  }
  .mobile-menu.is-open {
    top: 72px;
    grid-template-columns: repeat(2, 1fr);
    max-height: calc(100vh - 72px);
    overflow: auto;
  }
  .hero {
    min-height: calc(100svh - 72px);
  }
  .hero-inner {
    width: calc(100% - 32px);
  }
  .hero h1 {
    max-width: 11em;
    font-size: clamp(36px, 10.8vw, 43px);
  }
  .hero p {
    font-size: 16px;
  }
  .hero-actions {
    flex-direction: row;
    flex-wrap: wrap;
    align-items: flex-start;
  }
  .hero-scroll {
    display: none;
  }
  .quick-links {
    grid-template-columns: repeat(2, 1fr);
  }
  .quick-links a:nth-child(2) {
    border-right: 0;
  }
  .quick-links a {
    padding: 24px 18px;
  }
  .section {
    padding: 64px 0;
  }
  .section-head {
    align-items: start;
    flex-direction: column;
  }
  .list-split,
  .content-layout,
  .event-detail,
  .auth-shell,
  .mypage-wrap,
  .admin-grid,
  .viewer {
    grid-template-columns: 1fr;
  }
  .division-grid {
    grid-template-columns: 1fr;
  }
  .division-grid a {
    min-height: 220px;
  }
  .brand-wall {
    grid-template-columns: repeat(2, 1fr);
  }
  .lnb {
    position: static;
    display: flex;
    overflow: auto;
    border-top: 0;
    border-bottom: 1px solid var(--line);
    padding-bottom: 10px;
    scroll-snap-type: x proximity;
    scrollbar-width: none;
    overscroll-behavior-inline: contain;
  }
  .lnb::-webkit-scrollbar { display: none; }
  .lnb strong {
    display: none;
  }
  .lnb a {
    flex: none;
    border: 0;
    border-radius: 999px;
    padding: 8px 12px;
    background: var(--surface);
    scroll-snap-align: center;
  }
  .info-grid {
    grid-template-columns: 1fr;
    gap: 14px;
  }
  .info-block {
    padding: 24px;
  }
  .content-layout {
    padding: 42px 0 70px;
    gap: 28px;
  }
  .event-list {
    grid-template-columns: 1fr;
  }
  .book-grid {
    grid-template-columns: repeat(2, 1fr);
  }
  .event-detail {
    gap: 30px;
  }
  .event-card footer,
  .survey-card,
  .article-meta {
    flex-wrap: wrap;
  }
  .detail-panel {
    position: static;
  }
  .board-row {
    grid-template-columns: 52px 1fr 90px;
  }
  .board-row .views {
    display: none;
  }
  .auth-visual {
    min-height: 280px;
    padding: 32px;
    justify-content: end;
  }
  .auth-visual h1 {
    margin: 16px 0 18px;
    font-size: 34px;
  }
  .auth-panel {
    padding: 42px 24px 54px;
    align-items: stretch;
  }
  .auth-panel-inner {
    width: 100%;
  }
  .auth-shell.is-signup .auth-visual {
    align-items: stretch;
    justify-content: end;
  }
  .auth-shell.is-signup {
    grid-template-columns: minmax(0, 1fr);
  }
  .auth-shell.is-signup .auth-visual-inner {
    position: static;
    margin-top: 0;
  }
  .auth-shell.is-signup .auth-panel {
    padding: 42px 24px 54px;
  }
  .signup-heading {
    align-items: start;
    flex-direction: column;
    gap: 6px;
  }
  .signup-progress {
    grid-template-columns: repeat(2, 1fr);
  }
  .signup-progress li {
    min-height: 52px;
  }
  .address-fields {
    grid-template-columns: 1fr;
  }
  .address-fields .field {
    grid-column: 1 !important;
  }
  .signup-submit {
    align-items: stretch;
    flex-direction: column;
  }
  .signup-submit .button {
    width: 100%;
  }
  .form-grid {
    grid-template-columns: 1fr;
  }
  .mypage-nav {
    padding: 28px 20px;
    width: 100%;
    min-width: 0;
    max-width: 100vw;
  }
  .mypage-nav nav {
    display: flex;
    overflow: auto;
    width: 100%;
    max-width: 100%;
    scrollbar-width: none;
  }
  .mypage-nav nav::-webkit-scrollbar { display: none; }
  .mypage-nav nav a {
    flex: none;
  }
  .mypage-content {
    padding: 36px 20px;
    width: 100%;
    min-width: 0;
    max-width: 100vw;
    overflow-x: clip;
  }
  .mypage-content .table-scroll {
    width: 100%;
    min-width: 0;
    max-width: 100%;
    overflow-x: auto;
    overscroll-behavior-inline: contain;
  }
  .application-actions {
    min-width: 180px;
    max-width: 220px;
  }
  .education-cancel-form {
    width: 100%;
    min-width: 0;
  }
  .corporate-layout,
  .corporate-member-row,
  .group-history-row {
    grid-template-columns: 1fr;
  }
  .corporate-connect-panel {
    position: static;
  }
  .corporate-request-row,
  .corporate-summary {
    align-items: flex-start;
    flex-direction: column;
  }
  .corporate-member-actions,
  .corporate-member-actions form {
    justify-content: flex-start;
  }
  .corporate-member-actions select,
  .corporate-member-actions input {
    max-width: none;
    width: 100%;
  }
  .group-participant-grid {
    grid-template-columns: repeat(2, minmax(0, 1fr));
  }
  .group-cancel-form {
    grid-column: auto;
  }
  .location-info,
  .ci-showcase {
    grid-template-columns: 1fr;
  }
  .org-chart {
    padding: 26px 14px;
  }
  .org-row,
  .org-row.org-divisions {
    grid-template-columns: 1fr;
    width: 100%;
  }
  .stat-row {
    grid-template-columns: repeat(2, 1fr);
  }
  .admin-sidebar {
    transform: translateX(-100%);
    transition: 0.2s;
  }
  .admin-sidebar.is-open {
    transform: none;
  }
  .admin-shell {
    margin-left: 0;
  }
  .admin-main {
    padding: 20px 14px;
    overflow-x: hidden;
  }
  .admin-topbar {
    padding: 0 16px;
  }
  .mobile-only {
    display: inline-flex !important;
  }
  .admin-stats {
    grid-template-columns: repeat(2, 1fr);
  }
  .data-table {
    min-width: 720px;
  }
  .viewer-sidebar {
    display: none;
  }
  .viewer-page {
    margin: 12px;
    padding: 34px 24px;
  }
  .viewer-toolbar {
    top: 72px;
    padding: 12px 16px;
  }
  .page-title {
    padding: 56px 0 40px;
  }
}

@media (max-width: 480px) {
  .group-participant-grid {
    grid-template-columns: 1fr;
  }
  .group-participant-toolbar {
    align-items: flex-start;
    flex-wrap: wrap;
  }
  .group-participant-toolbar strong {
    width: 100%;
    margin-left: 0;
  }
}
@media (max-width: 480px) {
  .field-action {
    grid-template-columns: 1fr;
  }
  .field-action .button {
    width: 100%;
  }
  .consent-row {
    grid-template-columns: auto minmax(0, 1fr);
    padding: 16px;
  }
  .consent-row a {
    grid-column: 2;
  }
  .signup-progress li {
    font-size: 12px;
  }
}
@media (max-width: 420px) {
  .brand {
    width: 170px;
  }
  .quick-links a {
    font-size: 14px;
  }
  .book-grid {
    grid-template-columns: 1fr 1fr;
    gap: 16px 10px;
  }
  .book-cover > span {
    padding: 16px;
    font-size: 18px;
  }
  .choice-grid {
    grid-template-columns: 1fr;
  }
  .admin-stats {
    grid-template-columns: 1fr 1fr;
  }
  .admin-stat {
    padding: 15px;
  }
  .admin-stat strong {
    font-size: 23px;
  }
}
@media (max-width: 768px) {
  .header-logout {
    display: none;
  }
}